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Parent Company Financial Information - STATEMENTS OF OPERATIONS (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income                      
Interest income $ 85,684 $ 70,161 $ 68,733 $ 45,427 $ 45,797 $ 42,429 $ 40,874 $ 37,505 $ 270,005 $ 166,605 $ 118,356
Noninterest income 9,451 8,221 8,759 4,683 4,318 5,968 4,468 4,848 31,114 19,602 14,388
Expense                      
Interest expense 7,514 5,870 5,395 3,724 3,493 3,420 3,313 3,304 22,503 13,530 12,057
Noninterest expense 49,895 39,612 48,496 29,747 25,377 25,860 23,713 23,633 167,750 98,583 73,538
Net income before income taxes                 102,226 65,318 40,724
Income tax 19,370 10,619 7,521 4,616 7,238 5,877 6,358 5,742 42,126 25,215 15,209
Net income $ 16,171 $ 20,232 $ 14,176 $ 9,521 $ 11,953 $ 9,227 $ 10,369 $ 8,554 60,100 40,103 25,515
Corporation                      
Income                      
Interest income                 36 31 27
Noninterest income                 0 0 0
Total income                 36 31 27
Expense                      
Interest expense                 4,720 3,844 3,937
Noninterest expense                 8,956 3,769 2,831
Total expense                 13,676 7,613 6,768
Net income before income taxes                 (13,640) (7,582) (6,741)
Income tax                 (5,417) (2,785) (2,783)
Net loss (parent only)                 (8,223) (4,797) (3,958)
Equity in net earnings of subsidiaries                 68,323 44,900 29,473
Net income                 $ 60,100 $ 40,103 $ 25,515